Tschischewski BOK-5

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Tschischewski BOK-5
BOK-5
Type: Experimental flying wing
Design country:

Soviet Union 1923Soviet Union Soviet Union

Manufacturer:

BOK

First flight:

September 8, 1937

Number of pieces:

1

The Tschischewski BOK-5 ( Russian Чижевсий БОК-5 ) was a Soviet experimental flying wing aircraft from 1937. It was developed in the Office for Special Constructions (BOK), a department within the ZAGI .

development

The designer Wladimir Tschischewski , who was also the head of the BOK, incorporated the experience he had gained in the construction of flying wings in the construction of flying wings into the BOK-5. The plane was made of metal with fabric-covered oars. The cantilevered, trapezoidal wing was designed with two spars and had a ZAGI-890 profile. The part of the wings behind the second spar could be adjusted by + 5 ° / -3 °. The actual ailerons and elevators running over the entire trailing edge of the wing were designed as split flaps (Junkers double wings). A five- cylinder radial engine Schwezow M-11 served as drive . The landing gear was rigid and mostly came from a Polikarpow U-2 .

The flight tests began on September 8, 1937. The BOK-5 was easy to control, had good flight stability and was suitable for aerobatics. Nevertheless, after the tests had been completed, a planned all-metal flying wing fighter was not implemented.

Technical specifications

Parameter Data
crew 1
length 4.36 m
span 8.96 m
Wing area 23.15 m²
Empty mass 596 kg
Takeoff mass 764 kg
drive an air-cooled 5-cylinder radial engine Schwezow M-11
power 81 kW (110 PS)
Top speed 174 km / h near the ground
Landing speed 85 km / h near the ground
Summit height 4850 m
Range 200 km
Take-off / landing route 125 m / 200 m

See also

literature

Web links

Commons : BOK-5  - collection of images, videos and audio files
  • БОК-5. Retrieved November 17, 2017 (Russian, history, data photos).